The craw space of my home has very high humidity, from condensation of the moisture in the air. No moisture is coming up from the ground, which is covered in plastic. Moisture is collecting on the installation and floor joists, resulting in the growth of fungus and mold. An inspector suggested I seal off all the vents, then install a dehumidifier, which will bring down the RH and eliminate the problem. Collected water is discharged in a small tubing out through the foundation. Is this the way to go?